Thanks, Jack. I have looked over the material, and, yes, It would appear difficult, but not impossible, to get argente tris. The new litter has four out of six with red eyes...yes, they could all be PEW's. But I see the percentages as being more in my advantage, especially since I am in these breeding projects long-term. If I don't have a line with the necessary crossover, I will have one within two years. I have a feeling for mousebreeding, and I am very, very, persistent.
*edit* Ooh, ooh...there's a red-eyed (I think it's red-eyed) tri in the new litter; can't tell the colors yet, but exciting nevertheless! It has both light and dark patches, though. The pigments are showing in the skin